Water-cooled grate



June 20, 1950 D. KLIJZING WATER-COOLED GRATE Filed Dec. 12, 1947 F'IG.3

Patented June 20, 195% UNITED STS V UFFICE WATER-COQLED GRATEApplication December 12, 1947, Serial No. 791,227 In the NetherlandsJuly 5, 1946 Section 1, Public Law 690, August 8, 1946 latent expiresJuly 5, 1966 1 Claim.

The invention relates to a water cooled grate for a furnace consistingof hollow grate bars, through which cooling water flows.

Grates of this kind present the drawback that the bars exert a coolingeffect on the layer or" fuel so that the combustion immediately on thegrate is disturbed.

The invention has for its object to remove said drawback of these cooledgrates and to this end two longitudinally extending and upwards directedribs are provided on the upper side of the grate bars. In the groovebetween said ribs line particles of ashes are accumulated and form aninsulating layer and thus protect the layer of fuel against the coolingaction of the grate bars. Said ribs preferably are welded to the hollowbars in the form of strips and thus are integral with said latter.

The invention is illustrated on the accompanying drawing, in which:

Fig. 1 shows a plan View of the grate;

Fig. 2 is a cross sectional view on enlarged scale of part of the gratealong the line 11-11 of Fig. 1; and

Fig. 3 is a similar View of a grate bar of modified form.

The grate bars 5 at one of their extremities are connected to a chest 2which forms the dead plate, and at their other extremities the bars areconnected to a chest 3 serving as fire bridge. The cooling water entersinto the chest 3 at 5 and flows through the hollow bars I in order toleave the chest 2 at t.

To each bar I two longitudinally extending metal strips 6 are welded atl and said strips are forming ribs. In the groove formed between saidribs dust and line particles of ashes accumulate whereby the layer offuel is protected against cooling.

As appears from Fig. 3 the ribs 6 need not be vertical and parallel butthey may also be directed unde some inclination.

As the ribs 6 are welded to the tube shaped bars along their wholelength a favourable transfer of heat at the joint is secured, so thatthe ribs are not burnt.

It is to be noted that the grate when used in a steam boiler may beconnected to the water circulation of the boiler. The form of the gratemay be chosen at arbitrary as the invention may be applied to horizontalgrates as well as to inclined grates.

What I claim is:

A water cooled furnace grate comprising two spaced headers, a pluralityof spaced parallel cylindrical tubes extending between and incommunication with said headers, an inlet for one header to supplycooling water to said header to be passed through said tubes, an outletfor the other header to exhaust water from said header and tubes, andtwo substantially parallel ribs extending substantially tangentiallyupward from the sides of each of said tubes to points above the uppercircumference of said tubes and longitudinally of said tubes betweensaid headers to define an ash receiving channel for insulating the upperportion of each of said tubes, the adjacent ribs of adjacent tubes beingin spaced relationship to define grate passages therebetween.

DANIEL KLIJZING.

REFERENCES CITED UNITED STATES PATENTS Name Date Gibson Nov. 16, 1926Number

